Reactor Coolant

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Reactor Coolant


a liquid or gaseous substance that is passed through the core of a nuclear reactor and removes from the core the heat released as a result of the fission reaction.

In power reactors, the coolant flows from the reactor to a steam generator, where steam is produced to drive the turbine. Alternatively, the coolant itself, whether steam or gas, may serve as the working fluid for driving the turbine. In research reactors, such as materials-testing reactors, and in special-purpose reactors, such as isotope-production reactors, coolants are used only to remove heat from the core.

Reactor coolants must meet the following requirements: small neutron-absorption cross section (in thermal reactors), low moderation of neutrons (in fast reactors), chemical stability under conditions of intense irradiation, low corrosiveness with respect to the structural materials with which the coolant is in contact, high heat-transfer coefficient, high specific heat, and low working pressure at high temperatures.

In thermal reactors, the coolant used may be light water, heavy water, water vapor, an organic liquid, or carbon dioxide. The coolants employed in fast reactors include liquid metals— primarily sodium—and gases, such as water vapor and helium. In many cases, the coolant also serves as a moderator.


References in periodicals archive ?
Westinghouse Electric Company, a group company of Toshiba Corporation (TKY:6502), Curtiss-Wright Corporation, and the State Nuclear Power and Technology Corporation (SNPTC) of China, has completed the design, manufacture and qualification of the lead AP1000(R) Reactor Coolant Pump.
TURBOdesign1 was used to redesign an existing Reactor Coolant Pump in order to meet the increased flow rate and head required by the plant as a result of increased power output of the nuclear power plant to 1400 MW.
Projects included analyzing the impact of a potential fire on equipment located in key areas of the plant, replacing the in-core instrumentation sensor system that monitors reactor fuel conditions, and removing and replacing a reactor coolant pump motor that weighs 57 tons.
The biggest problem they left behind was leaking reactor coolant - liquid metal - which still orbits Earth with the cores.
It defines "unrecoverable plant condition" as "the loss of any shutdown function(s) for such a duration as to ultimately cause the reactor coolant level to fall below the top of the reactor core and lead to a subsequent breach of the fuel cladding.
Reactor coolant carbon dioxide gas escaped from storage tanks at Wylfa nuclear power station on Sunday,but a spokesman for BNFL Magnox Generation said that the leak was not radioactive and there was no danger to the public Picture: GERALLT RADCLIFFE
The MoD recently had to recall the Royal Navy's fleet of 12 nuclear-powered submarines for safety checks to their reactor coolant systems after a leak was found on HMS Tireless.
com/research/2x29q9/analyzing_the_mark) has announced the addition of the "Analyzing the Market for Nuclear Reactor Coolant Pumps in United Kingdom" report to their offering.
He says: "Components like reactor coolant pumps on 1GW plants are huge, two storeys high, that the UK can't supply.
The steel-reinforced concrete structure goes through a pre-stressed post-tensioned construction process to function as the third radiological protective barrier, in addition to the fuel rods and reactor coolant system.
The plant's operator said it was shut down as a precautionary measure, after a leak was detected in a sample line used to monitor the boron content of reactor coolant.
MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]--reactivity contribution due to the change in reactor coolant average temperature from [T.

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